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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estudo e implementação de uma luminária de iluminação pública à base de LEDs / Study and implementation of a LED public lighting luminaire

Maggi, Tiago 18 February 2013 (has links)
This work presents a study for the design and implementation of a LED Street light Luminaire. It shows the necessary characteristics for the proposed fixture replace the traditional models with High Pressure Sodium lamps (HPS), which are commonly used in Brazil. For this, it has been done a study and implementation of a LED fixture prototype that can replace a conventional fixture, keeping the photometric characteristics required by Brazilian standards. With this, is possible a significant reduction in the electrical power consumption by exploring the LED features such as high energy efficiency, long life, low luminous flux depreciation during the life and facility for light direction control. Here is presented an analysis of some traditional HPS lamps models to allow comparison of results of the prototype proposed. In this study is verified that the proposed LED fixture can reach similar levels of illuminance on the road that HPS modes, however using almost 50% of electric power. / Este trabalho apresenta um estudo para o projeto e a implementação de uma luminária de Iluminação Pública a base de LEDs, onde são apresentadas as características necessárias para que a luminária de LED proposta possa substituir os modelos tradicionais com lâmpadas de Vapor de Sódio de Alta Pressão (VSAP), que são usualmente utilizados no Brasil. Para tal, foi realizado um estudo detalhado e a implementação de um protótipo de uma luminária de LEDs que possa substituir as luminárias convencionais, mantendo as características fotométricas exigidas pelas normas vigentes no Brasil. Com isso, é possível uma redução significativa no consumo de energia elétrica, explorando as características dos LEDs como: alta eficiência energética, longa durabilidade, baixa depreciação luminosa e facilidade no direcionamento da luz. É apresentada uma análise elétrica e fotométrica de alguns modelos tradicionais bem como do protótipo proposto para permitir a comparação de resultados. No estudo é verificado que com a luminária de LED proposta pode-se atingir níveis de iluminação similares aos das luminárias com lâmpadas VSAP utilizando praticamente 50 % da potência elétrica.
2

Design lampy pouličního osvětlení se solárním napájením / Design of Street Lamp with Solar Power

Bulatova, Dinara January 2016 (has links)
Cílem diplomové práce se stane návrh designu solárního pouličního osvětlení, které bude splňovat nároky na design v 21. století. Přípravné analýzy ukáží možné směry, kterými by se měl úspěšný design zvoleného projektu vydat. Průzkum současných projektů existujících ve veřejném prostoru rovněz odhalí hlavní nedostatky stávajících návrhů. Na základě těchto poznatků bude možné přistoupit k tvorbě několika variant designu, ze kterých bude zvolena finální verze. Tato verze bude zpracována dle určených specifikací s ohledem na platné normy pro veřejné osvětlení.
3

Light Pollution – A Global Discussion

Schulte-Römer, Nona, Dannemann, Etta, Meier, Josiane 10 October 2019 (has links)
In recent years, artificial light at night is increasingly recognized as a multifaceted problem that is expanding on a global scale. Astronomers were the first to criticize the loss of the dark, star-filled night. In recent years, biologists, physicians, and scientists from many other disciplines have joined the protest against light pollution.

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